Shaft Collar, System of Measurement Metric, Shaft Locking Type – Couplings 1 Piece Clamp, Bore Type – Collars Plain Bore, Bore Dia. 10 mm, Material – Collars 2024 Aluminum, Outside Dia. 25 mm, Width 6 mm, Clearance Dia. 27.2 mm, Screw Size M2.5 x 8, Screw Material Alloy Steel, Operating Temp. Range -40 Degrees to 225 Degrees F